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How The Hall Sensor Works
- Sep 10, 2018 -

There is A hall semiconductor in the magnetic field, and constant current I passes from A to B. Under the effect of lorentz force, the electron flow of I is deflected to one side when passing through hall semiconductor, making the film generate potential difference in the direction of CD, which is called hall voltage.



The hall voltage varies with the intensity of the magnetic field. The stronger the magnetic field, the higher the voltage, the weaker the magnetic field and the lower the voltage. The hall voltage value is very small, usually only a few millivolts. If hall integrated circuit is used as sensor, it is necessary to change magnetic induction intensity mechanically. The method shown below is to use a rotating impeller as a switch to control magnetic flux. When the impeller blade is in the air gap between magnet and hall integrated circuit, the magnetic field deviates from the integrated chip, and hall voltage disappears. In this way, the change of output voltage of hall IC can indicate a certain position of the impeller drive shaft. With this working principle, hall IC chip can be used as the ignition timing sensor. The hall effect sensor is a passive sensor, which needs an external power supply to work. This feature enables it to detect low running speed.


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